我正在尝试使用spark从hbase读取数据。我使用的版本是spark 1.3.1和hbase 1.1.1。我有以下错误
ERROR TableInputFormat: java.lang.NullPointerException
at org.apache.hadoop.hbase.TableName.valueOf(TableName.java:417)
at org.apache.hadoop.hbase.client.HTable.<init>(HTable.java:159)
at org.apache.hadoop.hbase.mapreduce.TableInputFormat.setConf(TableInputFormat.java:101)
at org.apache.spark.rdd.NewHadoopRDD.getPartitions(NewHadoopRDD.scala:91)
at org.apache.spark.rdd.RDD$$anonfun$partitions$2.apply(RDD.scala:219)
at org.apache.spark.rdd.RDD$$anonfun$partitions$2.apply(RDD.scala:217)
at scala.Option.getOrElse(Option.scala:120)
at org.apache.spark.rdd.RDD.partitions(RDD.scala:217)
at org.apache.spark.rdd.MapPartitionsRDD.getPartitions(MapPartitionsRDD.scala:32)
at org.apache.spark.rdd.RDD$$anonfun$partitions$2.apply(RDD.scala:219)
at org.apache.spark.rdd.RDD$$anonfun$partitions$2.apply(RDD.scala:217)
at scala.Option.getOrElse(Option.scala:120)
at org.apache.spark.rdd.RDD.partitions(RDD.scala:217)
at org.apache.spark.ShuffleDependency.<init>(Dependency.scala:82)
at org.apache.spark.rdd.ShuffledRDD.getDependencies(ShuffledRDD.scala:80)
at org.apache.spark.rdd.RDD$$anonfun$dependencies$2.apply(RDD.scala:206)
at org.apache.spark.rdd.RDD$$anonfun$dependencies$2.apply(RDD.scala:204)
at scala.Option.getOrElse(Option.scala:120)
at org.apache.spark.rdd.RDD.dependencies(RDD.scala:204)
at org.apache.spark.scheduler.DAGScheduler.org$apache$spark$scheduler$DAGScheduler$$getPreferredLocsInternal(DAGScheduler.scal
代码如下
public static void main( String[] args )
{
String TABLE_NAME = "Hello";
HTable table=null;
SparkConf sparkConf = new SparkConf();
sparkConf.setAppName("Data Reader").setMaster("local[1]");
sparkConf.set("spark.executor.extraClassPath", "$(hbase classpath)");
JavaSparkContext sparkContext = new JavaSparkContext(sparkConf);
Configuration hbConf = HBaseConfiguration.create();
hbConf.set("zookeeper.znode.parent", "/hbase-unsecure");
try {
table = new HTable(hbConf, Bytes.toBytes(TABLE_NAME));
} catch (IOException e) {
e.printStackTrace();
}
JavaPairRDD<ImmutableBytesWritable, Result> hBaseRDD = sparkContext
.newAPIHadoopRDD(
hbConf,
TableInputFormat.class,
org.apache.hadoop.hbase.io.ImmutableBytesWritable.class,
org.apache.hadoop.hbase.client.Result.class);
hBaseRDD.coalesce(1, true);
System.out.println("Count "+hBaseRDD.count());
//.saveAsTextFile("hBaseRDD");
try {
table.close();
sparkContext.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
我不能解决这个问题。我用的是hortonworks沙盒。
1条答案
按热度按时间qyyhg6bp1#
你写过:
如果您使用的是1.1.1 api:
在devapidocs中,我只能看到两个构造函数:
用于内部测试的受保护htable(clusterconnection conn,bufferedmutatorparams)。
受保护的htable(tablename tablename、clusterconnection connection、tableconfiguration tableconfig、rpcretryingcallerfactory rpccallerfactory、rpccontrollerfactory rpccontrollerfactory、executorservice pool)创建用于访问hbase表的对象。
第一个构造函数的params构造函数是:
BufferedMutatorParams(TableName tableName)
tablename没有构造函数。所以你必须像这样初始化你的htable:
如果您使用的是0.94 api:
htbale的施工人员是:
htable(byte[]tablename,hconnection connection)创建一个对象来访问hbase表。htable(byte[]tablename,hconnection connection,executorservice pool)创建一个对象来访问hbase表。
htable(org.apache.hadoop.conf.configuration conf,byte[]tablename)创建一个对象来访问hbase表。
htable(org.apache.hadoop.conf.configuration conf,byte[]tablename,executorservice pool)创建一个对象来访问hbase表。
htable(org.apache.hadoop.conf.configuration conf,string tablename)创建一个对象来访问hbase表。
因此,最后一点,您只需要传递字符串名称,而不需要传递字节[]
应该没问题。